add banner (#260)

* adds banner

* link update

Author: edublancas

README.md

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 <!--- ###### _To learn more please refer to my book [Web Application Development with Streamlit](http://tinyurl.com/2p8mw32d)._ --->
 
+> [!TIP]
+> Looking for enterprise support for your Streamlit apps? Check out the [Ploomber platform](https://ploomber.io/streamlit-enterprise?utm_source=st-authenticator)!
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+
 ## Table of Contents
 - [Quickstart](#1-quickstart)
 - [Installation](#2-installation)